You can still buy merchant gift cards at Weis with credit cards. It's just visas/mcs and Reloadits that require debit only. In my opinion it's still worth using debit to get the gas awards. If you use TMobile to load you get the Reloadit fee reimbursed so you are getting free gas.
Weis is very strict about their own gift cards. No gas awards are given on those. But they don't seem to categorize any other kind of gift card as an exclusion even though their T&C include gcs.